Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1903017993ad687…

MALICIOUS

PDF

67.8 KB Created: 2021-09-17 16:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68de685a5dd8626fb158f37bc16ff3b4 SHA-1: b806f0140129112061ce5e0c0c2618d50193fd4a SHA-256: d1903017993ad687ad24cdb9abb8990ae4297564c7134391dfae002068a754c5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's an image-only lure designed to trick users. It contains numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing campaign. Although no scripts were explicitly extracted, the PDF structure and the presence of external links strongly suggest it is used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jbdclothiers.net/emailer/userfiles/file/fukovowawoko.pdf In PDF document text
    • http://qwerty.pl/_data/file/24024157128.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/cbc67c1f80374c7fa867f16c119aa071/50317562763.pdfIn PDF document text
    • http://reflita.lt/uploads/files/60060707678.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/jujuxadokibezosujina.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/98594290310.pdfIn PDF document text
    • http://cloverdiamond.com/file/82406120258.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/xonobokojamibile.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/musejiwiguwi.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/jewabe.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/5274963816.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/wegoxopopabibepiwani.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134cb7f40fae---27496068212.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/38188199267.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/bivixotajuzoluzag.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/xixufo.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/betenipezesif.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/60542582147.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/kibesapeludufomozixoj.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/31242748480.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/62895864926.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/31b7df1dfdd5edfd559e120a053967bb/84672968059.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/23088899673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=guardian+tales+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01B 13536 bytes
SHA-256: c77fd783e34558be925e5b3a26e5fd95497341946c05d327a0cf3269a91ec8d4
font_01_sfnt_off0000d120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD120 10784 bytes
SHA-256: 6ad20a1707393007334be356e180a3069fedafbfc999271d2b37d3da0ada4d2a
font_02_sfnt_off0000e9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1